reduce unnecessary proxying in ProcessorBridge

Author: yaauie

libs/logstash-bridge/src/main/java/org/elasticsearch/logstashbridge/ingest/ProcessorBridge.java

@@ -46,6 +46,10 @@ default void execute(IngestDocumentBridge ingestDocumentBridge, BiConsumer<Inges
     default IngestDocumentBridge execute(IngestDocumentBridge ingestDocumentBridge) throws Exception {
         IngestDocument internalSourceIngestDocument = ingestDocumentBridge.toInternal();
         IngestDocument internalResultIngestDocument = toInternal().execute(internalSourceIngestDocument);
+
+        if (internalResultIngestDocument == internalSourceIngestDocument) {
+            return ingestDocumentBridge;
+        }
         return IngestDocumentBridge.fromInternalNullable(internalResultIngestDocument);
     }